The coin is minted on one of the old 50ps and isn't currently in circulation

What are the most valuable 50p coins?

HAVE a rummage through the change in your pocket for rare 50p coins because they could be worth a small fortune.

Kew Gardens, up to £160

This rare commemorative coin was created in 2009 to celebrate the 250th anniversary of London’s Kew Gardens. Only 210,000 of these coins were issued and a quick check online shows up that a circulated coin with this design sold for £160 on eBay after it got 25 bids.

Sir Isaac Newton, up to £77

At first, just 375 of the Sir Isaac Newton coins were released into the tills at Woolsthorpe Manor in Lincolnshire, the birthplace and home of the famous scientist, but more of the coins were slowly released into circulation - adding up to a total of 1.8million. The majority of these coins are still boxed in protective packaging and they're selling for around £76.99 online.

There are currently 3.1million of the coins in circulation. Recently, one coin that had been in circulation fetched £7.50 on eBay - that's 15 times its face value.

WWF, up to £4.50

There are 3.4million coins in circulation and they are hugely popular amongst collectors. We found one that was recently sold for £4.50.

Britannia, up to £1.81

Britannia replaced by the new Royal Shield in 2008 as the standard 50p design, and none have been issued since, making the ones minted in that year valuable to collectors. Only 3.5million were issued into circulation and one recently sold on eBay for £1.81.

These coins were bigger and heavier than the ones you get today and were withdrawn from circulation in 1997.

But that doesn't mean you don't have one at home - so now might be the time to check your money boxes.

On eBay, a circulated coin will fetch around the same amount as an uncirculated coin in mint condition.

In September, one of the coins sold for £52 online after receiving nine bids.

But even ones in mint condition don't sell for as much as the Kew Gardens 50p which is actually the rarest design in circulation.

This coin can fetch up to a £400 online.

Latest on rare coins and valuable notes

SILVER LINING

Gruffalo 50p coin to go on sale TODAY - here's how much it will cost

QUIDS IN!

'Rare' £1 coin sells for £5,000 on eBay - do you have one at home?

COINING IT IN

The rarest and most valuable British coins - is your change worth £7,200?

We pay for your stories! Do you have a story for The Sun Online Money team? Email us at money@the-sun.co.ukor call 0207 78 24516.Don't forget to join the Sun Money's Facebook group for the latest bargains and money-saving advice.